condition to check if type is a CDT

Certified Associate Developer

Hello community,

I wonder if it is possible to check with in a if condition if a passed value of any type is a CDT.
I want to make a generic expression rule to convert a body from JSON to CDT with two rule inputs.
1 body of type text.
2 any type, but only CDT's so no integer, string etc.

So I want the to JSON function only to execute when the ruleinput is a CDT, if not I want to return a custom error message text string.
Are the CDT in a specific reserved numeric range so I can use that, or is there another approach?

Kind Regard,

Erik

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